Plate-hook for rotary presses.



J. W. PITT.

PLATE HOOK FOR ROTARY PRESSE S.

APPLICATIPN FILED DEC-22, I915- 1 47,574. Patented Nov. 20, 1917.

indicated at line,

son of Fig; 3 with the p s nrn i.

vJ'Ol-IN w. PITT, OF CHICAGO, ILLINOIS, ASSIGNOROF ONE-FOURTH T0 ELSIE STRONG,

. V OF CHICAGO, ILLINOIS.

Application filed December 22, 1915.

To all wham it mqg gconcem: Bevit known tlRL'tI JOHN WLPIT .a citizen vof the United States, residing at Chicago, in the county of Cook and State ofglllinois, have invented tnew and useful Improvementsin Plate-Hooks for Rotary Presses, .of which the following is a specification, reference, being had to the accompanyingdrawings, forming a part thereof.

This invention relates to a device known as, a platehookand used for temporarily attaching a printing plate to a suitable bed provided in the printing press a and adapted to holdlthegplateein operative position f011P1lDfi1'lg. It consists of the features and elements described. ings as indicated by the claims.

In the, drawings ,Figure 1 is a side elevation of the cylindrical bed of a so.called rotary press showing a printing; plate attached to such cylindrical'bed by means of plate Lhooks embodythis invention.

F ig.,2 is a [top plan view of oneeof the plate ,h ooks.

-Eig. 8.is a longitudinal .vertical section takenas indicated at line, 3.3, on Fig. 2. s Fig. 4 is. a transverse vertical-section taken H, on Fig. 8.

EThepla-te hook whichds thesubject of this invention is applicable to both flatv bed :monlythe flat bed press .is designedto, receive type of standard type height, and printing .plates'which are not themselves of type height are therefore necessarily mounted. upon suitable blocks to bring, them, to .the .levelofithe other type .faces in the bed. When. the bed. is cylindrical, howevem it .is not usually expected to receive ordinary ,unit type, but the printing is done from plates of. comparatively slight thickness which are s cured: to the surface of the cylinder. Such ,a cylinderis indicatedat Ain a Fig. l and is formed with spirally-disposed, grooves, which for-the purposes of the present in- ,vention needonly .be of. rectangular crosssection-and careluniformly spaced over-the cylindrical surface of the drum,.A. :The general character of i the plate hook employed for securing the printing .plate Q, 'on,the cylinder, A, is similar to that illustrated in: Patent .No. 1,043,105, dated November, 5, 1 912, as may be seen ,bya comparidrawings of said patand shown in the draw-" during Specification of Iietters Patent.

cut. The plate-hook comprisesaiibody, D whose width issuch that said body will fit snugly in any one-of the slots,

inder, A, brlng and rLArE-HooKFon ROTARY rnnssns.

Patented -Nov.2@, mi "2/.

. Serial No. 68,171.

B, in the cylwhose height: is sufficient to grooves, B, fill the of small holes, B

drilled. at regular intervals in the bottom of the groove, and the body,l), is providedat (one end with, a

or pin, F, dimensioned to said holes, B

.and, the plate; hook desired longitudinaldownwardly-proj eating stud justfit in one of anchoring the body, a D, which it carries. at any position in. the slotaB.

. for

. Preferably this stud or pin, F, constitutes simply the ,10

wervend ofvthe screw, G,

mounted foryvertical. adjustment in the end of the body bl socket, G ,,in

suitable Wrench l 0ck,: D, and having ;a-squa re its upper end to *recelve; a for effecting such ad ustment. Intermediate itsendsthe screw, G, is tapered at G and this tapered portion engages the inner ends or pins, H, mounted to be thrust laterally out- .heads, -H of ward through .the side walls of the block, D,

and .havingobtusely ipoi-nted outer lends,

H intended; for engaging the side walls of the. groove, k B.

is of cast iron, while. are of hardened and, cylindrical bed presses,.;but vtmore com- H 2 ,may even Preferably the cylinder, A,

the thrust pins, H, steel so that. their j points, indentkthe side walls of the groove, B, \forsecuring zfirm engagement therewith. The ment is partly: to supplementlthel engagement of the stud,,F, with the hole,

purpose of such engag s BF, but

primarily toprevent the block, D, fromconr with respect to:

or under the out of the groove, 13, in radial direction the drum, A,.as :it might oth- W lower side of the drum, action of centrifugal iforce rapid rotationof said drum.

(By comparing the distance between the upper end of the screw, G, and

face of thepiblock, D, with thQudlStZl-HCG .of

protrusion of the lower from the block, (when. the. screw end, F, :of the screw D, it will be: seen that even is turned backto bringiits upper el'lClffitlSh with thevtop ofthe block 11-05 .-at which posit ion-the pins, Hywill be released from engagement rwith the .side walls of the groove,

portionaof the bottom of the b :B, there will still be ta short istud, -F,-;extendi ng from: the lock, D. This, While perhaps that is,'with their jaw members,

not sufficient to be relied upon completely for holding the block against longitudinal displacement, is sufficientto enable the operator to find the proper hole, B ,in the groove, B, with which to engage the stud, F, in re-adjusting or re-setting the block, D,

said hole. being located merely by feelingiforit with the protruding end of the stud, F, as the block, D, is moved along the groove B. When theproper position for the block is found,'-it is only necessary to set down the screw, G,'whereby the stud, F, is inserted farther intothe aperture, B and the pins, H, are simultaneously thrust outward by the wedging action of the tapered portion, G causing them to forcibly grip the side walls of the groove, B

It will be understood that such positioning or the block, D, will bring the plate hook, E, approximately in holdin position I with respect to the beveled edge, D

P e, the hook, E, is effected by inserting -a of the C. The final looking position of squared wrench member into the square socket, J of the screw, J, which, as shown J in Fig. 3, operates against the inclined plane, D forming a part of the interior bottom wall of the block, D. As more thoroughly described in Patent No. 1,0e3,105,

the reaction of the screw, J, against the inclined plane, D serves to force the jaw I or hook, E, 1011 itudinally in its guide-ways, D in the 13105 D, and into final holding engagement with the beveled edge of the plate,C.

7 By reason of the spiral arrangement of the grooves, B, on the cylinder,A, the hook or'j aw, E, must trend obliquely with respect to the body block,

I D, and it is also necessary to make the plate books as rights and letts- E, trending in oppositely oblique directions for use on the sides and ends respectively, of the plate. In the plate hook shown in the above mentioned patent, the portion of the jaw member, E, which engages the guide grooves, D is shown as circular, thus'perof the hook or jaw member, E, are curved as indicated in Fig. 2 to permit limited rotation of the jaw between the side walls of the block, D, but preventing complete rotation or reversal of the jaw within the block; :This permits the jaw, E, to accommodate itself to any inaccuracy in the edge of the plate, and would permit intentional obliquernounting of the plate on the drum, A, w1thin certainliniits, desired.

I claim 2-- 1. In combination with a. printingpress having a rectangular groove in its bed and a series of holes disposed at intervals in the bottom of such groove; a plate hook ior securing a printing plate on said bed,

comprising a body block formed to fit in said groove; means projecting from the bottom ot' the block to engage one of said holes in the groove bottom; gripping means adapted for protrusion fromthe sides of the block to engage the side walls of the groove,

and means for protruding or releasing "said gripping means at will."

2. In combination with a printing press having a rectangular groove in its'bedand a series of holes disposed at intervals in the bottom of such groove; a plate hook for securing a printing plateon said bed, comprisinga groove; means projecting from the bottom of the block to engage one of said, holes in the groove bottom; gripping pins adapted for protrusion from the sides of the block to engage the'side walls of the groove, and means for protruding orfreleasing said gripping pins at will.

3. In combination with va printing press having'a rectangular groove'in its bed and a series of holes disposed at intervalsin the bottom of such groove; a plate. hook for securing'a printing plate on said-bed, comprising a body blockformed to fit in said groove; means-projecting fromf the body block formed to fitin said 1 bottom of the block to engage one of said holes in the grooved bottom; obtusely pointed gripping pins adapted for protrusion from the sides of the block to engage the side wallsof the groove, and'means for protruding orreleasing said gripping pins at will.

4:. In 'combination with a printing press having a'rectang'ular groove in its bed and a series of holes disposed at intervals in the bottom of such groove; a plate hook for securing a printing plateon saidbed, comprising a body block formed to. fit in said groove; means projecting from the bottom of the block to engage one of said holes'infthe groove bottom; a pair of headed pins mounted in the side Walls of the block with their heads within said block, and a wedge mem ber adapted to be forced between said heads for protruding said pinsinto gripping en'- gagement with the side walls of the groove.

5. In combination with. a 'printingIpre'ss having'a rectangular grooveinits bed and a series ct -holes disposed at intervals in the bottom of such groove; a plate hook ior securing a printing plate on said bed, comprising ,a -body block formechto f fit in said groove means projecting fromthe bottom of the blockto engage one "of said holes in e g ve b tt m; tr it; i -h e d. pins mounted in the side walls of the block with their heads within said block, and a screw in the block having a tapered portion positioned between the heads of said pins and adapted to wedge the pins apart and into engagement with the side walls of the grOoVe when said screw is advanced in the block.

6. In combination with a printing press having a rectangular groove in its bed and a series of holes disposed at intervals in the bottom of such groove; a plate hook for securing a printing plate on said bed, comprising a body block formed to fit in said groove, and a screw mounted in the block having a reduced end portion dimensioned to fit any one of said holes in the groove bottom, said screw being mounted for upand-down adjustment in the block for varying the protrusion of its reduced end therefrom.

7. In combination with a printing press having a rectangular groove in its bed and a series of holes disposed at intervals in the bottom of such groove; a plate hook for securing a printing plate on said bed, comprising a body block formed to fit in said groove a screw mounted in the block having a reduced end portion dimensioned to fit any one of said holes in the groove bottom, said screw being mounted for up-and-down adjustment in the block for varying the protrusion of its reduced end therefrom; and gripping de-, vices adapted for protrusion in respectively opposite directions from the sides of the (topics of this patent may be obtained for five cents each, by addressing the block for engaging the side walls of the groove, the said screw having a tapered portion adapted to act as a wedge for effecting such protrusion of the gripping devices.

8. In combination with a printing press having a rectangular groove in its bed and a series of holes disposed at intervals in the bottom of such groove; a plate hook for securing a printing plate on said bed, comprising a body block formed to fit in said groove; a screw mounted in the block having a reduced end portion dimensioned to fit any one of said holes in the groove bottom, said screw being mounted for up-and-down adjustment in the block for varying the protrusion of its reduced end therefrom; said screw having a tapered portion and gripping pins mounted in the block in position to be protruded laterally therefrom for engaging the side walls of the groove when said tapered portion of the screw is advanced between said pins, the reduced end of the screw protruding normally a slight distance from the bottom of the block and being farther protruded by such advance of the screw for protruding the gripping plns.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 18th day of December, 1915.

JOHN W. PITT.

Witnesses:

Roar. N. BURTON, EDNA M. MACINTOSI-I.

Gommissioner of Patents,

. Washington, D. G.

CTI 

